Pietro Fiorentini Zero Governor F3Z Regulator

Pietro Fiorentini’s ZERO Governor F3Z is a self-acting, air/gas ratio pressure regulator designed for high-precision control in combustion applications. Built to comply with ANSI Z21.8 standards, the F3Z is ideal for use in burner systems, mixing tees, proportional pre-mixers, and nozzle mixers. With a balanced valve and double-diaphragm design, this regulator ensures consistent air/gas ratios—even with fluctuating inlet pressures—while providing a secure backup in case of diaphragm failure.

Key Benefits

• Maintains constant air/gas ratio across flow conditions

• Accurate outlet pressure control regardless of inlet pressure variations

• Double diaphragm for enhanced safety and failure protection

• Complies with ANSI Z21.8 and CSA 6.22 standards

• Suitable for natural gas, LPG, and non-corrosive gases

Features

• Balanced valve design for high outlet pressure accuracy

• Air/gas ratio control of 1:1

• Nozzle, burner, and mixer compatible

• Optional integrated filter

• Durable construction with corrosion-resistant materials

Benefits

• Increases safety and combustion efficiency in burner systems

• Reduces risk of system failure due to diaphragm redundancy

• Adapts to changing airflows in real-time for better flame stability

• Minimizes emissions and optimizes fuel consumption

• Easy maintenance via top-entry design

Capability

• Inlet pressure: up to 7.25 PSIG

• Outlet pressure: 0.2 – 60.2" W.C.

• Compatible with control air pressure: 0.2 – 60.2" W.C.

• Sizes: 1/2" to 4" NPT or ANSI 150RF

• Minimum ΔP (Pu – Pd): 8" W.C.

• Ambient operating range: 14°F – 140°F

Construction

• Double-diaphragm fail-safe design

• Optional integrated stainless steel filter

• Air connection: 1/4" NPT

• Heavy-duty housing with optional ANSI flange connections

• Integral bypass drilling option for added control